GitHub Actions allows for parallel job execution to enhance workflow efficiency. By employing the "parallel" keyword, multiple jobs run concurrently, reducing task completion times. The article explores the maximum number of parallel jobs,
How to Run Parallel Jobs in GitHub Actions
GitHub Actions is a powerful tool for automating your software development workflow. One of the features that makes GitHub Actions so powerful is the ability to run parallel jobs. This can be a huge time-saver for tasks that can be broken down into smaller, independent steps.
To run parallel jobs in GitHub Actions, you need to use the parallel
keyword in your workflow file. The parallel
keyword takes a list of job names as its argument. For example, the following workflow file will run two jobs, job1
and job2
, in parallel:
name: My Workflow on: [push] jobs: job1: runs-on: ubuntu-latest steps: - echo "Hello from job1!" job2: runs-on: ubuntu-latest steps: - echo "Hello from job2!"
When this workflow is run, both job1
and job2
will start running at the same time. Once both jobs have completed successfully, the workflow will complete.
How Many Simultaneous Parallel Jobs Can Be Run in GitHub Actions?
The number of simultaneous parallel jobs that can be run in GitHub Actions depends on the type of runner that you are using. For self-hosted runners, the maximum number of parallel jobs that can be run is equal to the number of CPUs on the runner. For GitHub-hosted runners, the maximum number of parallel jobs that can be run is 20.
Can Parallel Jobs in GitHub Actions Share the Same Secrets?
Yes, parallel jobs in GitHub Actions can share the same secrets. To share secrets between parallel jobs, you can use the secrets
context. The secrets
context is a dictionary that contains all of the secrets that are available to the workflow.
To access the secrets
context in a job, you can use the secrets
keyword. For example, the following job will print the value of the MY_SECRET
secret:
name: My Job on: [push] jobs: job1: runs-on: ubuntu-latest steps: - echo "The value of MY_SECRET is: ${{ secrets.MY_SECRET }}"
How to Debug Parallel Jobs in GitHub Actions?
There are a few different ways to debug parallel jobs in GitHub Actions. One way is to use the actions/runner-debug
action. This action will print a lot of useful information about the runner, including the environment variables that are available to jobs.
To use the actions/runner-debug
action, add the following to your workflow file:
name: My Workflow on: [push] jobs: job1: runs-on: ubuntu-latest steps: - uses: actions/runner-debug@v1
Once you have added the actions/runner-debug
action to your workflow file, you can run the workflow and see the output in the GitHub Actions logs.
Another way to debug parallel jobs in GitHub Actions is to use the -vv
flag when running the github-actions
CLI. This flag will print a lot of additional information about the workflow, including the steps that are being executed and the resources that are being used.
To use the -vv
flag, run the following command:
<code>github-actions -vv run workflow.yaml</code>
The output of the -vv
flag can be helpful for troubleshooting issues with parallel jobs.
The above is the detailed content of how to run parallel jobs in github actions. For more information, please follow other related articles on the PHP Chinese website!

Git and GitHub are essential tools for modern developers. 1. Use Git for version control: create branches for parallel development, merge branches, and roll back errors. 2. Use GitHub for team collaboration: code review through PullRequest to resolve merge conflicts. 3. Practical tips and best practices: submit regularly, submit messages clearly, use .gitignore, and back up the code base regularly.

Git and GitHub are not the same thing: Git is a distributed version control system, and GitHub is an online platform based on Git. Git helps developers manage code versions and achieve collaboration through branching, merge and other functions; GitHub provides code hosting, review, problem management and social interaction functions, enhancing Git's collaboration capabilities.

After installing Git, in order to use more efficiently, the following settings are required: Set user information (name and mailbox) Select text editor Set external merge tool Generate SSH key settings Ignore file mode

Resolve: When Git download speed is slow, you can take the following steps: Check the network connection and try to switch the connection method. Optimize Git configuration: Increase the POST buffer size (git config --global http.postBuffer 524288000), and reduce the low-speed limit (git config --global http.lowSpeedLimit 1000). Use a Git proxy (such as git-proxy or git-lfs-proxy). Try using a different Git client (such as Sourcetree or Github Desktop). Check for fire protection

Causes of slow Git downloads include poor network connections, Git server problems, large files or large submissions, Git configuration issues, insufficient computer resources, and other factors such as malware. Workarounds include improving network connectivity, adjusting firewall settings, avoiding downloading unnecessary files or submissions, optimizing Git configuration, providing adequate computer resources, and scanning and removing malware.

How to update local Git code? Use git fetch to pull the latest changes from the remote repository. Merge remote changes to the local branch using git merge origin/<remote branch name>. Resolve conflicts arising from mergers. Use git commit -m "Merge branch <Remote branch name>" to submit merge changes and apply updates.

Steps to update git code: Check out code: git clone https://github.com/username/repo.git Get the latest changes: git fetch merge changes: git merge origin/master push changes (optional): git push origin master

You can delete a Git branch through the following steps: 1. Delete the local branch: Use the git branch -d <branch-name> command; 2. Delete the remote branch: Use the git push <remote-name> --delete <branch-name> command; 3. Protected branch: Use git config branch. <branch-name>.protected true to add the protection branch settings.


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